GloFish Tetra Care Guide

GloFish Tetra Care Guide

Do you know that GloFish were the first genetically-modified animals to be sold as pets?

These vibrant little fish are sure to add some color to your aquarium, and they’re relatively easy to care for.

This guide will cover everything you need to know about GloFish Tetra care, including diet, habitat, and tank mates.


Scientific NameDanio rerio
OrganismZebrafish (Danio rerio)Black tetra (Gymnocorymbus ternetzi)
Tiger barb (Puntius tetrazona)
Rainbow shark (Epalzeorhynchos frenatum)
AggressionSemi Aggressive
Minimum Tank Size10 gallon
Length1.5–6 inches long, depending on species
Ease of CareEasy to care for
pHBetween 6.8 and 7.8.
Temperature65°F – 75°F (18°C – 24°C)

GloFish Tetra Origins

Glo Fish was created in the early 2000s in Singapore. They are a zebra line fin tetra that has been genetically modified with a fluorescent protein gene.

The original purpose was to help detect pollution in waterways, as the transgenic fish would absorb the environmental toxins.

However, it was quickly discovered that these fish were also fantastic, and so they became widely available as ornamental pets.

GloFish Tetra Lifespan

The average GloFish life span is about 2 to 3 years. However, some GloFish have been known to live up to 5 years or more.

The key to a long and healthy life for your GloFish is providing them with a clean and well-maintained environment.

Regular water changes and filtration will help keep your fish healthy and looking their best. So keep your GloFish swimming happily for years to come by giving them the best care possible.

What Are the Features of GloFish Tetra?


GloFish is a type of fish that was created in the lab.

They absorb the light of specific wavelengths and then re-emit it, which gives the impression that they are glowing. You can also enhance their fluorescent color by a blue LED, actinic and black light.

They are available in several bright color variations of red, green, blue, orange, pink, yellow, and purple.

These species make great tank addition for people who enjoy watching fish swim around in their tank and are interested in the science behind them.


The Glofish was one of the first genetically modified fish to be marketed to the public.

It was created by a company called AquaBounty Technologies, and it was initially launched in two colors: green and red.

However, over time, the Glofish company has developed and launched four more colors.

The six unique colors Glofish comes in are Starfire red, Electric green, Sunburst orange, Cosmic blue, Galactic purple, and Moonrise pink.

These new colors were created by adding a different fluorescent protein gene to the fish’s genome.

Types Of GloFish

GloFish Barbas

These fish are unique in that they are fully capable of producing melanin, unlike other GloFish variants. This gives them a beautiful ‘high-contrast’ look not seen in the rest of the GloFish species.

Despite the color morph, these fish still have four tiger-like black vertical stripes in their bodies; these black bands are chunky and cover several prominent areas.

GloFish Danios 

GloFish Danios are some of the most stunning fish around.

Even with genetic modification and color morphs, they have retained the iconic five steel-blue horizontal stripes that fade into the dins and extend onto the tail fin.

Their fins have a translucent and luminous look, making them look magical.

Like the rest of the goldfish species, they glow under the blue or black LED light.

However, they don’t produce the internal glow; their bodies simply reflect the lights instead of generating them. They are, nevertheless, fascinating fish to see.


The GloFish tetra is a genetically modified fish that has been bred to create bright fluorescent hues.

They are tiny, peaceful freshwater fish that will look great in your aquarium. They prefer to live in groups of six or more and have a lot of colors such as Red, green, and blue.

GloFish Sharks

The GloFish shark is a unique-looking fish. It has a long, thin body with a flat abdomen and a pointed snout, and the prominent raised dorsal fin distinguishes it from other fish species.

This fish has two eyes on each side of its head, sometimes sunken in appearance.

The body is rounded near the head and the back and tapers off as it reaches the tail.

It is also covered in tiny scales that are usually silver in color, and the belly is usually a pale white or cream color.

Is GloFish Tetra Hardy?

GloFish tetras are not just a pretty face; they are also hardy and can make a great addition to any community tank.

They are also peaceful fish that get along well with other fish. Just make sure you provide them with the right conditions and keep them in groups because they love company.

How to Care for GloFish Tetra?

1. Tank Size

As we mentioned, GloFish tetras is a schooling fish, so they love company. For that reason, you should keep them in groups of at least six fish.

The general guideline is that 3 gallons of tank room per fish are required. That means a shoal of five GloFish requires 15 gallons of water.

However, this is only a reference point; you may require more or less space depending on the size of your fish and how active your GloFish is.

2. PH Level

One thing to keep in mind when keeping GloFish is their PH level. GloFish needs a PH level that is between 6.8 and 7.8.

If your PH level is outside this range, it can be harmful to the fish.

3. Lighting

One of the most important considerations for keeping GloFish healthy and vibrant is providing the proper lighting.

In particular, the blue LEDs are essential, as they help the fish fluoresce brightly. A blacklight will also make your GloFish fluoresce, but the light will be dimmer.

In most cases, the best light for GloFish is a LED light that has a mix of white and blue LEDs.

Another important consideration for lighting is the intensity of the light. Too much light can be harmful to GloFish, so finding a balance that works for your fish is essential.

Too little light, on the other hand, can lead to a decline in health and vibrancy.

In general, 12 hours of light and 12 hours of darkness os perfect for these species.

4. Temperature

GloFish are tropical fish and as such, they need a temperature of at least between 65°F – 75 Fahrenheit to stay healthy.

If the water is too cold, they may become sluggish or sick, and if the water is too warm, they may become stressed and more prone to illness.

So, it’s important to monitor the temperature of your GloFish tank and make sure it stays within the ideal range.

You can use a simple aquarium thermometer to monitor the temperature of your tank, or, if you have a more advanced setup, you may have a digital temperature controller that regulates the water temperature automatically.

Either way, it’s essential to keep an eye on the temperature and make sure it doesn’t fluctuate too much.

5. Filters

One of the most important aspects of keeping GloFish healthy is to ensure that their water is adequately filtered.

There are a variety of filters on the market designed specifically for GloFish tanks, and choosing the right one can be tricky.

Here are a few things to keep in mind when selecting a filter for your GloFish tank:

Size of the tank: Filters come in various sizes, so be sure to choose one that is appropriate for your tank size.

Flow rate: The flow rate of a filter is how much water it can move per hour.

You want to choose a filter with a flow rate equal to or greater than the size of your tank.

6. Tank Decoration

If you’re looking for a way to add some extra personality to your GloFish tank, then aquarium decorations are the way to go!

GloFish tank decorations come in a variety of styles, ranging from basic and understated to fun and festive.

One popular option for GloFish tanks is the GloFish Moon Jellyfish Tank Decoration.

This decoration is a replica of a real moon jellyfish, and it even lights up in colors that match your GloFish.

It’s a fun and unique way to add some extra personality to your tank, and your fish will love swimming around it.

Another great option is the GloFish LED Bubble Wall Decoration.

This decoration creates a beautiful bubble wall that adds visual interest to your tank.

Plus, the LEDs create a colorful light show that your fish will love swimming through.

GloFish Tetra Diet

GloFish are omnivores, which means they will eat both plants and animals.

In the wild, these fish would typically eat small insects, crustaceans, and other fish.

So, when you are feeding your GloFish, it is important to provide various food items.

You can give your GloFish brine shrimp, bloodworms, daphnia, and mosquito larvae.

It is also important to keep your GloFish diet balanced. You can do this by feeding them both plant and animal food items.

This will help ensure that your fish get the right nutrients to stay healthy.

GloFish Tetra Compatibility

These beautiful fish are peaceful and make great tank mates with other small fish.

However, they can be semi-aggressive to long-finned fish if they are slow, not too large, and aggressive.

So, if you’re thinking of keeping GloFish, be sure to keep them in groups and provide plenty of hiding places for your other fish.

GloFish Tetra can be kept with the following fish:

  • Guppies
  • Mollies
  • SwordTail
  • Platies
  • NeonTetra
  • Corydoras
  • Bristlenose Pleco
  • Zebra Danio
  • Angel Fish
  • Dwarf Gourami

GloFish Tetra Predators:

  • Angelfish
  • Bala shark
  • Cichlids

Is GloFish Tetra Reef Safe?

Yes, GloFish Tetra Reef is safe for both salt and freshwater aquariums.

They prefer living in an aquarium with plenty of hiding places.

So, make sure to add some rocks, plants, or driftwood to your aquarium to provide them with the hiding places they need.

GloFish Tetra Gender Difference

There are some subtle differences between male and female GloFish that can be used to sex them. the main difference is in the shape of their bodies.

Male GloFish tend to have a more elongated and slender body shape, while female GloFish have a more rounded body shape.

Male GloFish also tend to have more prominent fins, while female GloFish tend to have smaller, less noticeable fins.

They are generally brighter and more intensely colored than female GloFish.

However, there can be some variation between different individuals, so it is best to use other physical characteristics to sex them.

GloFish Tetra Breeding

GloFish Tetra are relatively easy to breed in the home aquarium.

To increase the chances of breeding, it is best to keep a group of at least 6 fish. This will help ensure that there is a good ratio of males to females.

It is also best to provide plenty of hiding places in the aquarium for the fry to hide from predators.

When spawning, GloFish Tetra will lay their eggs on plants or other surfaces in the aquarium.

The parents will then guard the eggs until they hatch. Once the fry have hatched, they should be fed small live foods such as brine shrimp or bloodworms.

As they grow, you can start to feed them larger live foods and eventually move them onto flake food.

Possible Diseases and Prevention

DiseasesSymptoms Prevention

Fin rot
Fins that have frayed or are falling off : the fin base is generally red.Improve water quality; consult your local aquatic specialist or veterinarian for treatment

Eyes: cottony growth or discolorationUse a commercial antifungal medication as directed; see your local aquatic expert or veterinarian for treatment of fish.

Cloudy eyes, open sores or reddening of the skinImprove water quality; use a commercial antibacterial remedy as directed; consult your local aquatic specialist or aquatic veterinarian for treatment

Spots appear on the fins and body of the fish; it rubs against hard objects or swims erratically; and it breathes quicklyDo not leave infected fish in your aquarium; quarantine them immediately using salt from a freshwater aquarium and as directed by the manufacturer of the commercial ich remedy; for treatment, consult your local aquatic expert or veterinarian.


How Are GloFish Made?

GloFish is made by inserting the fluorescent genes from anemones and jellyfish into the eggs of zebra danio.

The first generation of GloFish were created this way, and they have been a popular pet ever since.

Today, you can also find GloFish in other colors, thanks to new genetic modifications.

While the process of creating GloFish is a bit more complicated than simply buying them from a store, it’s still a relatively easy process.

Why Do GloFish Die So Fast?

There are two potential reasons why GloFish might die more quickly in your aquarium.

The first possibility is that they are overfed in an aquarium. However, the more likely reason is that they do not acclimate properly to their new environment.

If a tank does not have an established nitrogen cycle, it can quickly kill GloFish.

This is because the fish are not used to the high levels of ammonia and nitrites in the water.

Improper acclimation can also cause stress on the fish, which can lead to death.

To avoid these problems, it is important to acclimate GloFish properly when setting up a new aquarium.

You should slowly add water from the new tank to the old tank and then add the gloFish. This will help them adjust to the new water parameters gradually.

It is also important to keep the tank clean and well-maintained so that ammonia and nitrite levels stay low.

Doing so will help keep your GloFish healthy and reduce the chances of them dying prematurely.

Are GloFish Tetras Aggressive?

Glofish tetras are semi-aggressive towards other fish, particularly those with long fins.

This aggression is triggered by the long fins, which resemble the fins of their prey.

If a group of GloFish contains two or more males, they may become aggressive towards each other to pair up with the female.

Can GloFish Eat Goldfish Food?

The answer is yes and no.

Goldfish food is formulated for goldfish’s dietary and metabolic needs, which consists of more plant matter.

GloFish could eat goldfish food for a short time but should be provided with a variety of flakes, pellets and frozen foods formulated for their specific dietary needs to maintain their long-term health.

In general, Goldfish food is not the ideal diet for GloFish, but they can eat it if necessary.

So, be sure to provide them with a variety of other food options to keep them healthy and happy.

Can Tetra GloFish Have Babies?

Yes! Glofish tetras can have babies.

Like other fishes, they have a breeding process, and females produce eggs.

The female GloFish will lay her eggs in a secluded spot in the aquarium, often among plants or in a cave.

Once the eggs are laid, the male GloFish will fertilize them.

The eggs will hatch in about 24-48 hours, and the fry will be free-swimming a few days after that.

It’s best to remove the parents from the tank once the eggs are laid, as they may eat their own young.

Last Words

The GloFish Tetra is a very attractive and interesting fish to keep in an aquarium.

They are brightly colored and their scales reflect light, making them quite a spectacle.

They are not picky about their food, but they are sensitive fish that require good water quality and tank conditions to thrive.

If you are looking to keep one or more of these fish in your aquarium, make sure you buy a healthy specimen from a reputable dealer and provide the right conditions for your fish.

With good care, the GloFish Tetra can make a beautiful addition to any home aquarium.

If you still have any questions please share them with us in the comment section below.